Category: Dinoflagellate genomics

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Electrochemical genosensor for the detection of Alexandrium minutum dinoflagellates.
Talanta. 2021 Jan 15;222:121416
Authors: Morais SL, Barros P, Santos M, Delerue-Matos C, Gomes AC, Fátima Barroso…

This work addresses the development of a disposable electrochemical genosensor for the detection of the toxic dinoflagellate, Alexandrium minutum. Analyzing public databases, a specific 70 bp DNA probe, targeting A. minutum, was selected and designed. The genosensor methodology implied the immobilization of a A. minutum-specific DNA-capture probe onto screen-printed gold electrodes (SPGE). To improve both the selectivity and to avoid strong secondary structures, that could hinder the…

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A New Dinoflagellate Genome Illuminates a Conserved Gene Cluster Involved in Sunscreen Biosynthesis.
Genome Biol Evol. 2020 Nov 04;:
Authors: Shoguchi E, Beedessee G, Hisata K, Tada I, Narisoko H, S…

Photosynthetic dinoflagellates of the Family Symbiodiniaceae live symbiotically with many organisms that inhabit coral reefs and are currently classified into fifteen groups, including seven genera. Draft genomes from four genera, Symbiodinium, Breviolum, Fugacium, and Cladocopium, which have been isolated from corals, have been reported. However, no genome is available from the genus Durusdinium, which occupies an intermediate phylogenetic position in the Family Symbiodiniaceae and is well…

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The 5S rRNA genes in Alexandrium: their use as a FISH chromosomal marker in studies of the diversity, cell cycle and sexuality of dinoflagellates.
Harmful Algae. 2020 Sep;98:101903
Authors: de Busto…

Chromosomal markers of the diversity and evolution of dinoflagellates are scarce because the genomes of these organisms are unique among eukaryotes in terms of their base composition and chromosomal structure. Similarly, a lack of appropriate tools has hindered studies of the chromosomal localization of 5S ribosomal DNA (rDNA) in the nucleosome-less chromosomes of dinoflagellates. In this study, we isolated and cloned 5S rDNA sequences from various toxin-producing species of the genus…

Integrated omics unveil the secondary metabolic landscape of a basal dinoflagellate.
BMC Biol. 2020 Oct 13;18(1):139
Authors: Beedessee G, Kubota T, Arimoto A, Nishitsuji K, Waller RF, Hisata K, Yamasaki S, Satoh N…

Single cell transcriptomics of ABEDINIUM reveals a new early-branching dinoflagellate lineage.
Genome Biol Evol. 2020 Oct 12;:
Authors: Cooney EC, Okamoto N, Cho A, Hehenberger E, Richards TA, Santoro AE, Worden AZ…

CONCLUSIONS: Our genomic findings suggest intricate integration of various metabolic enzymes that function iteratively to synthesize metabolites, providing mechanistic insights into how dinoflagellates synthesize secondary metabolites, depending upon nutrient availability. This study provides insights into toxin production associated with dinoflagellate blooms. The genome of this basal dinoflagellate provides important clues about dinoflagellate evolution and overcomes the large genome size,…

Dinoflagellates possess many cellular characteristics with unresolved evolutionary histories. These include nuclei with greatly expanded genomes and chromatin packaged using histone-like proteins and dinoflagellate-viral nucleoproteins instead of histones, highly reduced mitochondrial genomes with extensive RNA editing, a mix of photosynthetic and cryptic secondary plastids, and tertiary plastids. Resolving the evolutionary origin of these traits requires understanding their ancestral states and…